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5. 1 (Cheng [4]). If Mn is an oriented compact locally conformally flat hypersurface in E n + 1 , n > 3, with constant scalar curvature n(n — l)r, then Mn is isometric to a standard round sphere Sn(r). 5, we know that there are many complete hypersurfaces, which have two distinct principal curvatures, one of which is simple, but are not isometric to , S n _ 1 (c) x E and S 1 (c) x E " - 1 . 7 (Cheng [4]). Let Mn be an n-dimensional oriented complete hypersurface in E n + 1 with constant scalar curvature n(n — l)r and with two distinct principal curvatures one of which is simple.

So using diagonal arguments, we can glue these individual limiting connections on each good ball of the above covering of M \ EQO together, and we can obtain a subsequence {tm}, such that Am = ^rniAm) ^oo on whole M \ EQO, where the limiting connection A^, is defined on whole M\ETO. 4. Obviously, Aoo is a smooth Yang-Mills connection off E ^ . 1), JM as tm —• oo. Since the gauge-invariance of \JA„ | 2 , we have / \JAJ*< m lim f + JM \JAJ=0. , AQO is a Yang-Mills connection on M \ EQQ. D. §5. 1 in [CS]).